[논문]스월-안정화 연소기에서 혼합기 공진모드가 동적 연소특성에 미치는 영향

한선우; 이신우; 황동현; 안규복

doi:10.15435/jilasskr.2022.27.1.18

[국내논문] 스월-안정화 연소기에서 혼합기 공진모드가 동적 연소특성에 미치는 영향
Effect of Mixing Section Resonance Mode on Dynamic Combustion Characteristics in a Swirl-Stabilized Combustor 원문보기

한국분무공학회지 = Journal of ilass-korea, v.27 no.1, 2022년, pp.18 - 25

한선우 (충북대학교 기계공학부) , 이신우 (충북대학교 기계공학부) , 황동현 (충북대학교 기계공학부) , 안규복 (충북대학교 기계공학부)

Abstract ▼ AI-Helper

Hot-firing tests were performed to experimentally confirm the effect of the eigenmode in the fuel-air mixing section on combustion instability by changing mixing section length, inlet mean velocity, equivalence ratio, and swirler geometry. A premixed gas composed of air and ethylene was supplied to the combustion chamber through an mixing section and an axial swirler. As the mixing section length increased, the inlet velocity perturbation decreased, but the combustion instability increased more. It was found that the resonance frequency of the first longitudinal mode in the mixing section shifted to the third longitudinal mode as the length of the mixing section increased. The results implied that the transition of the resonace frquency by changing the length of the mixing section might cause combustion instability.

주제어

표/그림 (10)

그림 Fig. 1 Schematic of the experimental rig
표 Table 1 Experimental conditions
그림 Fig. 2 RMS values of the filtered pressure fluctuation in the combustion chamber. (a) LI = 300 mm, 350 mm (b) LI = 450 mm, 500 mm
그림 Fig. 4 Normalized inlet velocity fluctuation at the whole experimental conditions
그림 Fig. 4 Normalized inlet velocity fluctuation at the whole experimental conditions
그림 Fig. 5 RMS value map of filtered pressure fluctuation in the (a) combustion chamber and (b) mixing section
표 Table 2 Frequencies of acoustic modes at combustor and mixing section
$Fig. 6 PSDs of the filtered pressure fluctuation in the combustion chamber at SN = 0.43, <TEX>$\bar{u}$</TEX> = 20 m/s$ 그림 Fig. 6 PSDs of the filtered pressure fluctuation in the combustion chamber at SN = 0.43, $\bar{u}$ = 20 m/s
$Fig. 7 PSDs of the filtered pressure fluctuation in the combustion chamber at (a) SN = 0.99, <TEX>$\bar{u}$</TEX> = 20 m/s, L<sub>I</sub> = 300 mm and (b) SN = 0.99, <TEX>$\bar{u}$</TEX> = 20 m/s, LI = 500 mm$ 그림 Fig. 7 PSDs of the filtered pressure fluctuation in the combustion chamber at (a) SN = 0.99, $\bar{u}$ = 20 m/s, L_I = 300 mm and (b) SN = 0.99, $\bar{u}$ = 20 m/s, LI = 500 mm
그림 Fig. 8 Phase difference between combustor pressure oscillation and heat release fluctuation

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